What are the standard WHO BMI categories?

Underweight is under 18.5, Normal weight is 18.5 to 24.9, Overweight is 25 to 29.9, and Obesity is 30 or higher.

Is BMI accurate for athletes?

Often not. Muscle weighs more than fat, so athletes can have a high BMI while being healthy.

Can children use this calculator?

No. Children's BMI must be compared with growth charts for their age and sex.

How is BMI calculated in pounds and inches?

BMI = 703 × weight in pounds ÷ (height in inches)². The calculator converts for you when you choose Imperial.

Are my measurements stored?

No. They are used only in your browser.

BMI & Ideal Weight Calculator

Calculate Body Mass Index (BMI) using metric or imperial measurements. Displays WHO classifications and target healthy weight ranges.

System:

Weight (Kilograms)

Height (Centimeters)

Your Body Mass Index

22.9

Normal weight

WHO Standard Classification

Healthy Weight Target (BMI 18.5 – 24.9):56.7 kg – 76.3 kg

WHO BMI Reference Ranges

UnderweightBelow 18.5

Normal weight18.5 – 24.9

Overweight25.0 – 29.9

Obesity30.0 and Above

How to use BMI & Ideal Weight Calculator

Select Metric (kg/cm) or Imperial (lbs/ft+in).
Enter your weight and height.
Review your BMI score, classification, and healthy weight range.

About BMI & Ideal Weight Calculator

Calculate body mass index (BMI) from your height and weight in metric or imperial units. See your BMI, its World Health Organization category, and the healthy weight range for your height.

What BMI measures

BMI is weight in kilograms divided by height in meters squared. The WHO categories for adults are: under 18.5 underweight, 18.5 to 24.9 healthy weight, 25 to 29.9 overweight, and 30 or more obesity.

The healthy weight range shown is the weight that would put you between 18.5 and 24.9 at your height.

Limits of BMI

BMI does not distinguish muscle from fat, so muscular people can score as overweight. It also does not reflect where fat is carried, which matters for health. Some health bodies use lower thresholds for people of Asian descent.

BMI for children and teenagers uses age- and sex-specific charts, so this calculator is for adults only. It is a screening tool, not a diagnosis; talk to a doctor about your health.

Common uses

Health check-ins: Get a quick screening number before a doctor's visit.
Fitness tracking: Track BMI alongside other measures over time.
Setting goals: See the weight range considered healthy for your height.
Forms: Find your BMI when a form or insurer asks for it.

Questions about BMI & Ideal Weight Calculator

What are the standard WHO BMI categories?: Underweight is under 18.5, Normal weight is 18.5 to 24.9, Overweight is 25 to 29.9, and Obesity is 30 or higher.
Is BMI accurate for athletes?: Often not. Muscle weighs more than fat, so athletes can have a high BMI while being healthy.
Can children use this calculator?: No. Children's BMI must be compared with growth charts for their age and sex.
How is BMI calculated in pounds and inches?: BMI = 703 × weight in pounds ÷ (height in inches)². The calculator converts for you when you choose Imperial.
Are my measurements stored?: No. They are used only in your browser.

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